High-speed Angular-scan Pulse-echo Ultrasonic Propagation Imager for In situ Non-Destructive Evaluation

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This study examines a non-contact laser scanning-based ultrasound system, called an angular scan pulse-echo ultrasonic propagation imager (A-PE-UPI), that uses coincided laser beams for ultrasonic sensing and generation. A laser Doppler vibrometer is used for sensing, while a diode pumped solid state (DPSS) Q-switched laser is used for generation of thermoelastic waves. A high-speed raster scanning of up to 10-kHz is achieved using a galvano-motorized mirror scanner that allows for coincided sensing and for the generation beam to perform two-dimensional scanning without causing any harm to the surface under inspection. This process allows for the visualization of longitudinal wave propagation through-the-thickness. A pulse-echo ultrasonic wave propagation imaging algorithm (PE-UVVPI) is used for on-the-fly damage visualization of the structure. The presented system is very effective for high-speed, localized, non-contact, and non-destructive inspection of aerospace structures. The system is tested on an aluminum honeycomb sandwich with disbonds and a carbon fiber-reinforced plastic (CFRP) honeycomb sandwich with a layer overlap. Inspection is performed at a 10-kHz scanning speed that takes 16 seconds to scan a 100 x 100 mm(2) area with a scan interval of 0.25 mm. Finally, a comparison is presented between angular scanning and a linear-scanning-based pulse-echo UPI system. The results show that the proposed system can successfully visualize defects in the inspected specimens.
Publisher
TECHNO-PRESS
Issue Date
2018-08
Language
English
Article Type
Article; Proceedings Paper
Keywords

COMPOSITE-MATERIALS; DAMAGE; TRANSDUCER; SYSTEM

Citation

SMART STRUCTURES AND SYSTEMS, v.22, no.2, pp.223 - 230

ISSN
1738-1584
DOI
10.12989/sss.2018.22.2.223
URI
http://hdl.handle.net/10203/245417
Appears in Collection
AE-Journal Papers(저널논문)
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